Physical Measurement
Quantification of mass per unit length represents the foundational quality check for all textile yarns and roving. Systematic linear density testing is performed to ensure that the yarn meets the required specifications for either warp or weft applications. The test involves measuring a specific length of yarn and weighing it on a precision balance.
This measurement is critical because it directly influences the weight and thickness of the woven fabric.
Laboratory Procedure
Environmental conditioning of the sample prior to weighing is essential to eliminate the influence of moisture absorption. Flax yarn can absorb up to twelve percent of its dry weight in water, which can skew the testing results if not controlled. Technicians calculate the final linear density by dividing the conditioned mass by the length, expressing the result in tex or lea.
This procedure is performed across multiple bobbins from each spinning frame to ensure consistency. Regular calibration of the weighing balance and the winding reel is required to maintain measurement accuracy over long production cycles.
Weaving Impact
Weavers utilize these test records to adjust their loom settings and prevent warp breakages. If the yarn has high density variations, the resulting cloth will show thick and thin lines, which can lead to customer rejections. This quality control step is therefore a prerequisite for releasing any yarn batch for shipping.
